mineral

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Hardness: 2.5–3 on Mohs scale; Color: Pink, lilac, violet-gray; Luster: Pearly to vitreous; Crystal structure: Monoclinic; Cleavage: Perfect basal; Specific gravity: 2.8–2.9.

Hardness: 2
Color: Pink, lilac, violet-gray
Luster: Pearly to vitreous

Identified June 6, 2026More mineral →

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Physical properties

Hardness: 2.5–3 on Mohs scale; Color: Pink, lilac, violet-gray; Luster: Pearly to vitreous; Crystal structure: Monoclinic; Cleavage: Perfect basal; Specific gravity: 2.8–2.9.

Formation & geological history

Formed primarily in lithium-bearing granite pegmatites. It is often associated with other lithium minerals like spodumene, amblygonite, and tourmaline. It occurs in late-stage magmatic crystallization.

Uses & applications

A major source of lithium (used in batteries and glass making); also used as an ornamental stone in jewelry, carvings, and as a popular mineral specimen for collectors.

Geological facts

Lepidolite is one of the most common sources of the rare alkali metals rubidium and cesium. Its name is derived from the Greek word 'lepidos' for scale, referring to its micaceous, scaly appearance.

Field identification & locations

Identify by its distinctive lilac or pink color and its soft, flakey (micaceous) texture. It can be found in pegmatite-rich regions like Brazil, Russia, Madagascar, and the United States (California/Maine).